Proportioning valve



June 30, 1931. G, F, NAAB PROPORTIONING VALVE Filed Nov. 14, 1927 Y i l'r l MII Patented `lune 30, 1931 UNITED STATES PATENT; OFFICE `GEORGE F. NAAB, OF CLEVELAND, OHIO, ASSIGNOR TO THE NORTHA AMERICAN IvIANU-- FACTURING COMPANY, F CLEVELAND, OHIO, A CORPORATION OF OHIOr PROPORT'IONING VALVE Application led November 14, 1927. Serial No. 233,159.

This invention relates to valves of the type known as proportioning valves, and having provision for air inlet, gas inlet, mixing of gas and air and delivery of the mixture; the Y purpose of such a valve being its employment in connection with the burner of a furnace or the like.

One of the objects of this invention is to provide a means of independently regulating the amounts of air and gas passed to the` mixing chamber so that the combustible quality of the mixture is controlled through the proportioning of the components employed; and at the same time to provide means for simultaneously actuating the parts to regulate the tot-al flow through the valve without disturbing the proportions of the mixture. Y Y

Another object of the invention is to so arrange the parts that the proportional regulation may be had without interruption of service of the valve.

Still another object of the invention is to provide means for insuring against explo-` sions in the valve and parts leading there- Further objects and advantages of the invention will appear from the following description taken in connection witlithe draw-A ings, in which Fig. 1 is a side elevation of the valve in operative assembly with the adjacent parts customarily provided; Fig. 2-

is a section in the plane of line 2-2, Fig. 1 showing the valve in section; Fig. 3. is a top view of the valve; Fig. 4 is a. section in the plane of line 4-4 Fig. 3y and showing the A valve in a section at 90o to the sectional showcircularly flanged rectangular openings 4 and centrifugalblower 7 arranged to be driven f by a motor 8 supported on a base 9, the outlet of the blower having .connection asV through the pipe 10 to the burner. The bore of the post 3 opens downwardly through the bottom of the base casting 1 which has provision as through the usual threads lindicated with a T fitting 11, the lower end of the T being closed by a plug 12 and the lateral arm of the T having connection with a pipe 13 leading from the gas supply.

The post 3 is provided with a lateral port 14 preferably lying opposite the opening 4 as indicated, Fig. 4. Within the post is fitted Y for communication with a gas supply and having a lateral rectangular port 16 adapted for cooperation withl a similar port 14in the post 3 to control the gas inlet. The stem 17 of the gas valve 15 extends upwardly of the base casting 1 and hasnon-adjustable connection as by the pin 18 with a handle 19. Fitting about the stem 17 immediately below vthe portion of the handle adjacent the stem 17 is a sleeve havingl a lmurled head 2O and a threaded shank 21, and having a short bearing surface 22 between its head and shank portions. Fitting the bearing 22 is a closure portion 23v of an air valve having a flange portion 24 seating upon the upper surface of the base casting 1 and a pair of downwardly eX- tending valve segments 25 seating within the bore f2 of the base casting. The air valve segments 25 extend approximately 9()O and are spaced at 180 whereby a 90 rotation of the" air valve will open or close simultaneously both of the openings 4 and 5in the base casting. The air valve has connection with the handle 19 as by the bolt 26 turned into the flange 24 whereby the air valve and the gas valve may be caused to open and close together, and preferably ay slot 27 is provided in the handle forl accurateadjustinent to this end and to allow a lead to be given to the gas valve if desired.

The upper face of the base casting 1 is also preferably slotted as at 28 to receive and adjustab-ly position a stop bolt 29 adapted to cooperate with a stop lug 30 on the flange 24 of the air valve whereby the maximum opening of bot-h the air valve and gas valve may be limited, astop 31 being arranged to be engaged by the lug 30 in the oli177 positions of the valves.

The lower interior of the-gas valve is threaded as indicated to receive a tubular member 32 provided with a pair of notches 33 37 will become effective only just as the gas engageable by a suitable hey which may be inserted through the T 11 by removal ot the plug 12, whereby the effective size and therefore t-he maximum o-pening` ot the port 16 `may be adjusted.

For corresponding adjustment of the air valve l provide an air valve adjusting member having a hub engaging the threaded sleeve portion 21 and a pair ot segmental skirt portions 35 seating in the bore 2 between the segmental portions 25 of the air valve; whereby the vertical positionv of the skirt portions may be adjusted by turning the linurled head 20 of the sleeve.

ln each of the air valve segments 25 is an opening. The opening 36 or" the segment 25 cooperating with the outlet opening l is positioned approximately medially ot its mem- `ber 25 (in the horizontal plane); but the opening 37 of the member cooperating i with the opening 5 on the inlet side is positioned in its member 25 so that during valve movement toward ott position the opening valve is closed. j

' tremity of the recess in the base casting 1, and a spring 89 in the properly combustible mixture.

compression between the washers illustrated serves to maintain the seating of the air valve adjusting sleeve. A

Operation of the proportioning valve will be as follows: bviously the hollow of the base casting 1 closed by the parts as described forms a mixing chamber in which air and gas entering the proportioning valve will intermingle before delivery through the outlet opening ot the proportioning valve.

The gas supply through the pipe 13 being shut off the plug 12 is removed and the maximum opening of the gas valve port 16 is adjusted by turning the tubular member 32 to the proper relative position thereover. The plug 12 is next replaced, the gas turned on, the motor 8 started to run the blower 27, the proportioning` valve by means of the lever 19 turned to open position and by observation of the flame the head 20 is turned to move the skirts to adjust the air supply to give Therefore, at any position ot' the handle 19 between full closed and full open position, since both the air and gas ports are rectangular, the relative proportions of air and gas entering the mixing chamber will remain unaltered; and the stop bolt 29 may be secured in the proper position to limit the maximum delivery to the burner.

When it is desired to close down the burner the handle is turned to oli7 position, during this movement the opening 35 on the delivery end o1 the proportioning valve is uncovered allowing` the pressure within the mixing chamber to drop to that or the atmosphere, and after complete closing of the gas and air valves the .opening 37 is uncovered allowing a pull of air to be drawn through the parts leading to the burner and thus clean out all residual therein.

T he blower is then shut down. It will be obvious that the proportioning valve will function in similar manner where instead of the blower on the outletend of the valve air under pressure is supplied throughthe pipe 6.

Attention is particularly called to the employment orp rectangular ports in the gas valve and in the air valve whereby the opening and closing characteristics of these valves are what l-:nown as of the straight Vline t peg that is by the employment of such ports in both the valves and their seating members the area ot the opening of each valve will be directly proportional to the movement of the valif'e, in the example illustrated, to the angular movement of the valve from closed position.

vlVhat l claim is:

1. In a device of 'the class described, a casing having a cylindrical valve chamber with a. lateral port opening thereinto, a segmental valve in said chamber, secured with said casing against longitudinal movement and rotatable to openV and close said port, the valve having a longitudinally extending edge for the purpose, and adjacent said edge a segmental slrirt member associated with said valve for movement therewith and longitudinally adjustable independently of said valve to provide a secondary adjustment of the effective port area, independent of the setting of said valve.

2. 1n a device of the class described, a casing having a cylindrical valve chamber with opposed lateral ports openin g thereinto, valve means in said chamber having opposed segmental valve members, and secured with said casing against longitudinal movement and rotatable to open and close said ports together, and curtain means comprising an associated pair of segmental skirt members arranged between said valve members for movement therewith, and longitudinally adjustable independently of said valve means to provide a secondary control of flow through said device, independent of the setting of said valve means.

3. In a device of the class described, a pair IUD of valve means arranged for movement about a common aXis, one for air cont-rol and the other for gas control, actuating means associated with both said valve means to move the same together, and means for adjusting one of said valve means relative to said actuating means to provide a lead for one of said valve means relative to the other.

4. In a device of the character described, a casing having a cylindrical valve chamber with a pair of opposed inlet and outlet ports opening thereinto, segmental valve means rotatable in said chamber to open and close said ports together, and gas valve means arranged to provide inlet of gas centrally of said chamber, and associated with said segmental valve means to open and close therewith.

5. In a device of the class described, a casing having a mixing chamber, with air inlet, gas inlet, and outlet ports opening thereinto, valve means associated with said ports, actuating means associated with said valve means for simultaneous actuation of the same to open and close all of said ports together, said outlet valve means having a relatively small opening timed to communicate said chamber with said outlet port after closing of said gas port, and said inlet air valve means having a relatively small opening timed to communicate said chamber with said air inlet port thereafter, whereby as said actuating means is moved in valve closing direction, after closing ofsaid gas inlet port and substantial closing of said air inlet and outlet ports, said opening in said outlet valve means will allow equalization of the pressure within said chamber and that at said outlet port, and thereafter said opening in said air inlet valve means will allow a'puff of air to pass through said chamber to clear the same of residual gas.

6. In a device of the character described, gas valve means comprising a casing having a gas valve chamber with a lateral port openf ing thereinto, a hollow valve having a corresponding port and rotationally adjustable in said chamber to register said ports to allow flow therethrough, said valve having an open end and having fitted therewithin a tubular member longitudinally movable to adjust an end edge thereof in the Zone of said ports, whereby a. secondary adjustment of the eective port area, independent of the setting of the valve, may be had, and whereby flow through said valve may be through said ports, said tubular member and the corresponding end of said valve.

7. In a device of the class described, casing means having a pair of ported valve chambers, valves for said chambers, the valves and chambers being aligned and the valves being rotatable in their chambers for opening and closing, a stem associated with both valves for actuating the sameftogether and extending beyond the casing means for operating access,

casing, and in screw-threaded engagement with said skirt means.

In testimony whereof I hereby 'affix my signature.

GEORGE F. NAAB. 

